Objective To investigate multifunctional direct digital radiography system (DDR) in clinical practice, in order to improve the applied value of it.Methods EPEX DDR was performed in 1000 cases,these images were analysedby 3 senior radiologists and tried to find the best method of usually positions. Results The quality of DDR was assessed as grade A in73.00%, grade B in 22.70%, grade C in 4.30%, and no waste film.Conclusion DDR is easy to operate, fast in capturing image and can provide post-processing techniques, which will facilitate the accurate diagnosis of radiography.

Objective To explore the relationship between the impact of blood flow (the flow from right atrium and hepatic vein), diaphragm movement and the pathogenesis of membranous obstruction of inferior vena cava(MOVC). Methods Twenty cadavers were involved, measuring widths of inferior vena cava (IVC )at the diaphragmatic hiatus and the thoracic cage; and taking the IVC segment between the diaphragmatic hiatus and hepatic vein for tissue examination of IVC intimal thickness and type I collagen accumulation as group A and comparing with those of IVC above level of renal vein in Group B. Results IVC intimal thickness and type I collagen distribution area of Group A were greater than those of group B, showing statistically significant difference (P